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VBS_DNSCHANGE.F

August 15, 2016
 ALIASES:

VBS/DNSChanger.AA (ESET)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

992 bytes

File Type:

VBS

Memory Resident:

No

Initial Samples Received Date:

12 Aug 2016

Payload:

Connects to URLs/IPs

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other Details

This Trojan does the following:

  • Connects to possibly compromised server:
    • http://www.{BLOCKED}otas.com.br/contador.php?p=30123
    • http://www.{BLOCKED}otas.com.br/clique.php?p=30123
  • Run its script with elevated permissions.
  • Change DNS Server IP address to:
    • {BLOCKED}.{BLOCKED}.206.125

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.710.04

FIRST VSAPI PATTERN DATE:

12 Aug 2016

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as VBS_DNSCHANGE.F. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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